Those games are part of the Play Together program, they do not appear there just because their VIP servers cost 10 Robux. You must apply your game and be accepted to appear on this sort.
Not all of these games have had 10 Robux VIP servers. This is a gesture resolved by the game developers and Developer Relations for those who, with stay-at-home measures in place, are missing out on social opportunities they would’ve otherwise had. Games here are meant to simulate social interactions: slice of life, if you will.
This sort goes hand-in-hand with a lot of games and external businesses slashing prices on goods and services. Physical office locations for some businesses are closed if non-essential (depending on your country and the COVID-19 measures in place) and in light of some families losing income opportunities, businesses are lowering prices or granting free service trials so spending can still happen with less accessibility to money.
In reality, the sort aside, price your VIP servers appropriately. How I choose to price my VIP servers typically depends on how a VIP server can be used and how likely a player will be to purchase that VIP server knowing that they can get the most use out of it.
If your game doesn’t have a whole lot of VIP server benefits and they’re just intended for others to play with each other, give it a decently low price. The idea here is the cost-sale ratio (is that what it’s called?), where you sell more the lower your prices are but make less. That would be fine to do, because VIP servers shouldn’t be your primary revenue source and it just allows the same game to be played just amongst friends the server owner chooses.
On the other hand, if there’s more incentive or VIP-exclusive features for players, then you should give it a reasonably high price that your players will pay for knowing they can make the most out of it. Players who play your game a lot, are competitive for stats and can afford to pay a little more to try gaining an advantage will make the most of those servers. For example, in a wave survival game, you can hog/farm experience points with a private server. If you want to maintain good progression for your game, you wouldn’t allow everyone to just have a free boost like that for a low cost.
So, with that in mind, there is no ideal price for VIP servers. Think about how players can use a VIP server and how well your game is received, then use that to determine a sweet spot. If you need to make the sacrifice of earning less from VIP servers but selling more, do it, it might earn you more long term whereas higher costing servers with less sales will just give you more short term.
As for the sort, don’t make your VIP servers 10 Robux just to get onto the sort because you won’t. Your game needs to meet the requirements and you must apply or have Developer Relations approach you about your game before it is placed there.